Binderless zeolite adsorbent and preparation method thereof
A technology without binder and adsorbent, applied in chemical instruments and methods, inorganic chemistry, other chemical processes, etc., can solve the problems of low adsorption rate, small adsorption capacity, and high adsorption rate
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Embodiment 1
[0018] Take by weighing sodium aluminate (by weight percentage, containing Al 2 o 3 41%) 200 grams, in a 3000 milliliter beaker, add 1000 milliliters of water and stir to dissolve, add a certain amount of sodium hydroxide or sulfuric acid, keep Na 2 O / SiO 2 =0.75~1.6, then add 250 grams of silica sol (40 wt%), transfer to a 4000 ml reaction kettle, and crystallize at 70° C. for 10 hours. The product was taken out, washed with deionized water until neutral, and dried at 120°C for 10 hours to obtain 4A molecular sieve. The molecular sieve is mixed with sodium silicate with a weight ratio of 10%, and rolled into a ball to form the shaped adsorbent of the present invention. Shaped adsorbent and Al containing by weight percent 2 o 3 Mix with 15% alkaline sodium aluminate aqueous solution, so that the total molar ratio in the mixed system is Si / Al=1.0~2.5, Na 2 O / SiO 2 =0.50~1.6, soaked for 6 hours, moved into an airtight container, heated and crystallized step by step, after...
Embodiment 2～9
[0022] The preparation method of Examples 2-9 is exactly the same as that of Example 1, except that the ratio of raw materials, the type of binder, the amount of Al in the alkaline aqueous solution 2 o 3 The concentration and the specific crystallization conditions are different. The ratio of raw materials for the synthesis of molecular sieves is shown in Table 1, the type and amount of binder and Al in alkaline aqueous solution 2 o 3 The concentration is shown in Table 2, and the step-by-step crystallization conditions are shown in Table 3. After the adsorbent was dried, it was activated at 350°C for 2 hours, and then cooled to room temperature in a desiccator to evaluate the adsorption performance of the adsorbent. The evaluation conditions of the adsorbent are exactly the same as in Example 1, and the performance and evaluation results of the adsorbent are shown in Table 4.
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